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c#regexemailsmtpclientverification
TheElk
TheElk

Reputation: 1

Email address verification shows wrong addresses as correct

I have a question regarding email verification in (Visual) C#.

I searched the web and found several methods to do so. E.g. here:

Strangely both of them seem to let emails like "ex.as@asd,com" pass (notice the comma instead of a point).

However, if I try to send an email via SmtpClient object I get an exception because the given email address has the wrong format.

Any ideas?

Upvotes: 0

Views: 142

Answers (2)

CharithJ
CharithJ

Reputation: 47540

If you try below it will throw an exception in a way that you could validate the address.

try 
{
    address = new MailAddress("ex.as@asd,com", "Email validation").Address;
} 
catch(FormatException) {
    //Invalid email address
}

MailAdress.Address property throws FormatException when you try to get it.

Upvotes: 0

Vadim Pashkov
Vadim Pashkov

Reputation: 527

Regex from first link is working for me. You should replace all \ to \\ and " to \".

I tried this code:

var validateEmailRegex = new Regex("(?:[a-z0-9!#$%&'*+/=?^_`{|}~-]+(?:\\.[a-z0-9!#$%&'*+/=?^_`{|}~-]+)*|\"(?:[\\x01-\\x08\\x0b\\x0c\\x0e-\\x1f\\x21\\x23-\\x5b\\x5d-\\x7f]|\\\\[\\x01-\\x09\\x0b\\x0c\\x0e-\\x7f])*\")@(?:(?:[a-z0-9](?:[a-z0-9-]*[a-z0-9])?\\.)+[a-z0-9](?:[a-z0-9-]*[a-z0-9])?|\\[(?:(?:25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)\\.){3}(?:25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?|[a-z0-9-]*[a-z0-9]:(?:[\\x01-\\x08\\x0b\\x0c\\x0e-\\x1f\\x21-\\x5a\\x53-\\x7f]|\\\\[\\x01-\\x09\\x0b\\x0c\\x0e-\\x7f])+)\\])");
var isValidEmail = validateEmailRegex.Match("ex.as@asd,com").Success;

And i got isValidEmail == false.

Upvotes: 0

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